I installed an SSC P4. Be very careful to keep the bottom of the slug from contacting the post it will sit on for the heat sink. I shorted out my LE and had to buy a new one from four7's. The two part thermal epoxy from the Shoppe and a very thin shim fixed the problem. I also bought an McR-18S to go along with the Soule. The beam is very nice, I'm not certain how the Q2 reflector will work with a Soule. My max lux dropped from 2,200 to 1,340, YMMV with the Q2 reflector.
Edit: The cree is not on a star, it is a bare emitter. The emitter sits on a post in the heatsink with the edges of the ceramic base overlapping the edges of the post.